Dentosphere : World of Dentistry

 # Modiolus around the corner of mouth is formed by all EXCEPT: A. Orbicularis oris B. Buccinator C. Risorius D. Mentalis The correct answer is: D. Mentalis. The modiolus is a chiasma of facial muscles held together by fibrous tissue, located lateral and slightly superior to each angle of the mouth. It is contributed to by the following muscles: Orbicularis oris, Buccinator, levator anguli oris, depressor anguli oris, zygomaticus major, risorius, quadratus labii superioris, quadratus labii inferioris.  CLICK HERE FOR MORE MCQs.

 # Which of the following bone is not pneumatic? A. Mandible B. Frontal  C. Mastoid D. Ethmoid The correct answer is A. Mandible. Any bone, which contains air spaces within its body is called as pneumatic bone. Maxillary, frontal, ethmoid, mastoid, sphenoid bone, etc. all are ethmoid bones. Mandible is not a pneumatic bone. CLICK HERE FOR MORE MCQs

 # Danger layer of scalp is: A. Periosteum B. Connective tissue C. Loose areolar tissue D. Aponeurosis The correct answer is C. Loose areolar tissue. Danger area of scalp: - Loose areolar tissue contains the emissary veins and is termed as dangerous area of scalp because it allows spread of infection even, by the way of emissary veins, to cavernous sinus. CLICK HERE FOR MORE MCQs

# Remineralization of tooth surface is associated with which component of saliva? A. Amylase B. Statherin C. Crystatins D. Streapsinase The correct answer is B. Statherin Two of the families of small salivary proteins histadine and statherin help control the status of calcium and phosphorus in the saliva. CLICK HERE FOR MORE MCQs

 # Hypercalcemia occurs in which type of lung cancer? a) Oat cell b) Giant cell c) Squamous cell d) Alveolar cell The correct answer is C. Squamous cell carcinoma. - Non metastatic  extrapulmonary manifestations of lung cancers include metabolic, endocrine neurological and vascular and hematological and skeletal features.  - Endocrine (10%) (usually small cell carcinoma), ectopic adrenocorticotrophin syndrome, syndrome of inappropriate secretion of antidiuretic hormone (SIADH), Hypercalcemia (Usually squamous cell carcinoma). CLICK HERE FOR MORE MCQs.

# Most common periodontal disease is: A. Gingivitis B. Periodontitis C. Gingival hypertrophy D. Juvenile periodontitis    # Gingivitis is initiated most frequently by: A. Occlusal trauma B. Systemic factors C. Local irritating factors D. Hormonal defects

 # Which of the following conditions if not treated properly may lead to Noma? A. Diphtheria B. Herpangina C. Herpetic gingivostomatitis D. ANUG The correct answer is D. ANUG Clinical course of ANUG (Acute Necrotizing Ulcerative Gingivitis)  is indefinite. If untreated, NUG (Necrotizing Ulcerative Gingivitis) may lead to NUP (Necrotizing Ulcerative Periodontitis) with a progressive destruction of the periodontium and denudation of roots, accompanied by an increase in severity of toxic systemic complication.  Horning and Cohen Staging of Oral Necrotizing Diseases Necrotizing Ulcerative Gingivitis --> Periodontitis --> Stomatitis -->Noma Stage 1: Necrosis of the tip of interdental papilla Stage 2: Necrosis of entire interdental papilla or marginal gingiva or attached gingiva Stage 3: Necrosis extending to gingival margin Stage 4: Necrosis extending also to attached gingiva Stage 5: Necrosis extending into buccal or labial mucosa Stage 6: Necrosis exposing alveolar ...